Château de Kinugasa, Mountain fortress in Kanagawa, Japan

Château de Kinugasa is a mountain fortress situated on Mount Kinugasa in Kanagawa with stone foundations and wooden structures built in traditional Japanese style. The ruins retain their original layout showing where buildings and defensive walls once stood, marked by informational panels explaining the former arrangement.

Miura Tairyō Tameyuki, granted lands in Sagami Province for service in the Former Nine Years' War, established a residence at the foot of Mount Kinugasa in 1062, the origin of the castle. It became the Miura clan's base and was enlarged as they expanded. In 1180 Miura Yoshizumi backed Minamoto no Yoritomo; after the defeat at Ishibashiyama, Hatakeyama Shigetada's forces attacked and took Kinugasa, Yoshimasa dying in the fighting. The castle was abandoned after the 1247 Hōji War ruined the Miura.

The name Kinugasa comes from Mount Kinugasa, where the castle stood. Today the site is a small park with only a well and traces of moats remaining. Nearby, Daisen-ji Temple, whose grounds include the castle hill, and Mancho-ji Temple, the grave site of Miura Yoshisumi's father Yoshiaki, keep memories of the Miura clan alive.

The honmaru site lies behind Daizen-ji temple, and maps often place Kinugasa Castle slightly off from its actual spot. From Kinugasa Station on the Yokosuka Line, walk 8 minutes to Kinugasa Crossroads bus terminal, take a Keikyu bus to the Kinugasa Castle Ruins stop, then walk 15 minutes. The path continues past the castle hill up to the summit of Mount Okusu.

The site has almost no standing stone walls today: only a well and traces of a moat remain on Mount Kinugasa, now a small park. The main mound of the castle, the honmaru, lies behind the temple Daizen-ji, and maps often place the castle in a slightly different spot.